Abstract: A thermal insulation structure (100) including: a thermal insulation film (200); and a plurality of support members (300) that supports the thermal insulation film (200), in which the thermal insulation film (200) is supported by the support member in a state where tension is applied in an in-plane direction of the thermal insulation film (200), the support member (300) includes a first portion (310) and a second portion (320) that are separated from each other, and one or more third portion (330) that connects the first portion (310) and the second portion (320), and a length of the third portion (330) in an extending direction of the third portion (330) is longer than a distance between the first portion (310) and the second portion (320), the first portion (310) and the second portion (320) are disposed along a direction intersecting a surface of the thermal insulation film (200), and the support member (300) is elastically deformable in the direction intersecting a surface of the thermal insulation film (